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Topic 3 - The Atomic Structure

11. Isotope symbols: Recognizing symbols of the same isotope
1. Chlorine – 37 can also be represented as

37
17
17
1) 35 Cl 2) Cl 3) Cl 4) Cl
17 17 35 37

2. Magnesium -26 is the same as

26
12
12
1) 26 Mg 2) Mg 3) Mg 4) Mg
26 12 26 12

Interpreting electron configuration
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223
3. The symbol
Fr can also be represented as
85

1) Fr – 85 2) Fr – 138 3) Fr – 223 4) Fr – 308

4. The isotope symbol 27 Al can also be represented as
13
2) Aluminum–13 3) Aluminum–14 4) Aluminum-40
1) Aluminum–27

27
5. Which diagram represents the nucleus of an atom Al ?
13
14 n
27 n
14 n
1) 2) 3) 4) 40 n
13 p
27 p
13 p
13 p
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6. Which diagram correctly represents the nucleus of the symbol X ?
37
17
17 n
17 n
37 n
20 n
1) 2) 3) 4) 20 p
37 p
17 p
17 p

16 n
7. The nucleus diagram can also be written as
15 p
1) 31 P 2) P 3) S 4) S
31
15
16
15 15 16 16

8. The nucleus diagram of an atom is . Which symbol correctly represents this atom?
45 n
35 p
1) 35 Rh 2) Rh 3) Br 4) Br
80
45
80
45 45 35 35

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